| 杨冰,陈坷铭,李沁蔓,刘宇程.Na2S2O8、H2O2在氧化处理石油污染土壤中的持续有效性研究[J].农业环境科学学报,2019,38(10):2377-2385. |
| Na2S2O8、H2O2在氧化处理石油污染土壤中的持续有效性研究 |
| Persistence and effectiveness of oxidants during the treatment of petroleum-contaminated soil by chemical oxidation with Na2S2O8 and H2O2 |
| 投稿时间：2019-06-28 |
| DOI：10.11654/jaes.2019-0718 |
| 中文关键词: 石油污染 土壤 原位修复 化学氧化 过硫酸钠 |
| 英文关键词: petroleum pollution soil in-situ remediation chemical oxidation persulfate |
| 基金项目:国家自然科学基金项目（21707111）；西南石油大学科研“启航计划”项目（2017QHZ018） |
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| 中文摘要: |
| 以过氧化氢（H2O2）和过硫酸钠（Na2S2O8）为氧化剂，通过室内模拟实验，研究不同氧化剂及分次添加方式（1次或分3次）、外源添加零价铁（ZVI）处理对石油污染土壤中石油烃类污染物的去除能力，探讨了不同处理下氧化剂的持续性和去除污染物的有效性。结果表明：在氧化剂初始浓度为21、63、105 mmol·L-1的处理中，H2O2在反应第2 d均已检测不到，Na2S2O8剩余量在反应10 d后分别为11、35、60 mmol·L-1；反应10 d后，总石油烃类（TPH）总去除率在氧化剂初始浓度为63、105 mmol·L-1的Na2S2O8处理中显著高于H2O2处理（P<0.05），分别高出12.41%、14.21%；在第4~10 d Na2S2O8和TPH剩余浓度的降低均非常缓慢，表明土壤中能活化Na2S2O8的物质不足；加入ZVI显著提高了TPH总去除率（P<0.05），尤其促进了第4~10 d TPH的持续降解（分别增加了8.46%、8.49%、12.26%）。总量相等的H2O2分3次在第0、24、48 h投加，反应10 d后TPH降解率比一次性投加分别提高了17.26%、25.43%、28.11%。通过对反应体系有机组分的GC-MS图谱分析，反应10 d后H2O2分3次添加、ZVI活化Na2S2O8处理中石油烃类总峰值分别降低了56.64%和57.60%，且部分长链烷烃被降解为相对较短的烷烃组分。研究表明： Na2S2O8在石油污染土壤中持续性优于H2O2，但Na2S2O8去除TPH的有效性随反应时间增加而降低；添加ZVI提高了Na2S2O8去除TPH的有效性；分批次投加H2O2提高了石油污染土壤中的TPH降解率。 |
| 英文摘要: |
| Hydrogen peroxide(H2O2)and sodium persulfate(Na2S2O8)were used to treat petroleum-contaminated soil in laboratory experiments. The influences of different oxidants, fractional addition methods(1 or 3 times), and external addition of zero-valent iron(ZVI)on the degradation of total petroleum hydrocarbon(TPH)were investigated. The persistence of oxidants and the effectiveness of removing pollutants under different treatments were discussed. The results showed that H2O2 was not detected on the second day of the reaction, but the remaining amount of Na2S2O8 was 11, 35, and 60 mmol·L-1, respectively, after 10 days of reaction in treatments with initial oxidant concentration at 21, 63, and 105 mmol·L-1. After 10 days of reaction, the total removal rate of TPH in Na2S2O8 treatment was 12.41% and 14.21% higher than that in H2O2 treatment with the initial oxidant concentration at 63 mmol·L-1 and 105 mmol·L-(1 P<0.05), respectively. The decrease of Na2S2O8 and TPH residual concentration was extremely slow on the 4th to 10th day, indicating that the substances capable of activating Na2S2O8 were insufficient in the soil. Adding ZVI to Na2S2O8 treatment significantly promoted the total removal rate of TPH(P<0.05), and the degradation of TPH during days 4~10 increased by 8.46%, 8.49%, and 12.26%, respectively, with initial oxidant concentration at 21, 63, and 105 mmol·L-1. When H2O2 was added in three portions at 0, 24, and 48 h, with initial total oxidant concentration at 21, 63, and 105 mmol·L-1, TPH degradation rate rose by 17.26%, 25.43%, and 28.11%, respectively, after 10 days of reaction. GC-MS analysis of the organic components showed that the total peak area of petroleum hydrocarbons decreased by 56.64% and 57.60%, respectively, in treatments with H2O2 added in three portions and ZVI-activated Na2S2O8, and some long-chain alkanes were degraded to relatively "short-chain" alkane component. The overall results show that persistence of Na2S2O8 in petroleum-contaminated soil is superior to that of H2O2, but the effectiveness of Na2S2O8 in removing TPH decrease with the reaction time. The addition of ZVI improve the effectiveness of Na2S2O8 in removing TPH. Fractional addition of H2O2(added three times)increase the degradation rate of TPH in petroleum-contaminated soils. |
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